2009-09-15 The Transmission of Electric Energy Part II

2009-09-15 The Transmission of Electric Energy Part II -...

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The Transmission of Electric Energy Part II Dr. Jovan Ilić ECE 18-418 Fall 2009

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Transformer Types • Single phase – Multi-winding – Tap changing • Three phase (3-phase network needs 3-phase transformers) – All of the single phase configurations – Different connections – Tap changing and phase shifting Y 
Example: multiple secondaries [4] Calculate Z1 1 2 2 1 3 3 2000 2 :1 1000 2000 4 :1 5000 VV a a 2 2 2 3 3 3 1000 20 500 500 10 50 IA Z Z 1 1 2 2 3 3 23 1 12.5 N I N I N I II aa  1 2000 160 12.5 V Z A

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Example: tapped secondaries [4] Calculate voltages 1 2 3 4 5 1 1 1 2 2 2 3 3 3 4 4 4 5 5 5 20 200 5.48 4 12.7 38.72 P P P P P W V PZ V V P Z V V V V P Z V V V
Three Phase Transformers • Three single phase cores joined • Possible spare core/windings • Tertiary winding – Harmonic suppression – Reactive power injection

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Single phase: Single phase multiple windings: Joining three single phase cores: Unsymmetrical and symmetrical three phase transformer: Note: From Electrical Power System Essentials
Three Phase Transformer Connections Note: From Electrical Power System Essentials

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The Yy-4 Transformer Note: From Electrical Power System Essentials
The Yd-11 Transformer Note: From Electrical Power System Essentials

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Yy0 Connection [5]
Connection Yd7 [5]

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The Magnetizing Current • Non-ideal transformer core - there is flux leakage – Magnetic field density in practice limited to 1.3T  constant - is not a linear function BH  
The Magnetization Current The magnetization current contains a third harmonic Note: From Electrical Power System Essentials

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2009-09-15 The Transmission of Electric Energy Part II -...

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